Abstract
tin and F. M. Uhler, U. S. Dept. Agric. Tech. Bul. 634, 1939). Though leaves, stems, winter buds, and other parts of pondweed plants are eaten, the seeds (technically fruits) are particularly relished and found commonly in gizzards. Most pondweed seeds obtained from duck gizzards can be identified to the species. Small-seeded species, especially when badly worn by digestion, are more difficult than larger ones and not infrequently their determination must be left at Potamogeton sp. Loss of the outer coverings through digestive action often aids identification instead of hin-
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